Reland of "WebRtcBrowserTest: Include all stats in getStats."

chrome/browser/media/webrtc/webrtc_browsertest_base.h

Index: chrome/browser/media/webrtc/webrtc_browsertest_base.h
diff --git a/chrome/browser/media/webrtc/webrtc_browsertest_base.h b/chrome/browser/media/webrtc/webrtc_browsertest_base.h
index 9eb26fe966edf7fb605ba32967c3be12d0bef1a1..0060ac31c3f44afecf5640b8ccb069414e7833b3 100644
--- a/chrome/browser/media/webrtc/webrtc_browsertest_base.h
+++ b/chrome/browser/media/webrtc/webrtc_browsertest_base.h
@@ -122,6 +122,8 @@ class WebRtcTestBase : public InProcessBrowserTest {
       content::WebContents* tab,
       const std::string& certificate) const;
 
+  void CreateDataChannel(content::WebContents* tab, const std::string& label);
+
   // Exchanges offers and answers between the peer connections in the
   // respective tabs. Before calling this, you must have prepared peer
   // connections in both tabs and configured them as you like (for instance by